Friction-clutch



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S. H. PITKIN.

EMOTION GLUTGHL No. 888,580. Patented Aug. 28, 1888.

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-S. H. PITKIIT,l FRIGTION CLUTCH.

Paten v Summa/toi Sie/sen Jl'. Pitffz'n UNITED STATES PATENT OFFICE.

STEPHEN H. PITKIN, OF AKRON, OHIO.

FRICTION-CLUTCH.

SPECIFICATION forming part. of Letters Patent No.388,580, dated August 28, 1888.

Applicition filed September 22, 1887. Serial No. 250.445. (No model.)

To all whom it may concern:

Be it known that I, STEPHEN H. PrrKIN, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented a certain new and useful Frietion-Olutch, of which the following is a speciiication.

My invention has relation to improvements in that class of friction-clutches in which motion is transmitted from the driving to the driven mechanism by a band connected with one of said parts, which surrounds and is arranged to be clamped upon a pulley-face connected with the other part.

The objects of my invention are to secure a maximum of driving-power from the band, to exactly counterbalance the parts in any position, and to produce a clutch adapted for lineshafting, frictionpulleys, and direct acting Inechanism where high speed is required.

My invention consists in the devices illustrated in the accompanying drawings,as hereinafter described and claimed.

In the accompanying drawings, Figure 1 is an end elevation of my improved clutch, in which the levers and wrist-pin arms are con- -neeted with a disk attached to the drivingshaft and clamp the bands ona pulley attached to a driven shaft; Fig. 2, a partial vertical central section of Fig. l at the line x x; Fig. 3, a plan of part of the driving-shaft, showing the sleeve and one of the links; Fig. 4, an end elevation of a clutch, in which the levers and wrist-pin are connected with a loose pulley and clamp the bands on a pulley keyed to the driving-shaft; F-ig. 5, a side elevation and partial section of Fig. 4 at the line y y, and Fig. 6 a transverse section of Fig. 4 at the line z z.

In the construction shown in Figs. 1, 2, and 3, A is a disk keyed to the driving-shaft a, secured to the face of which and diametrically opposite are arms B B', terminating in wristpins b b', and pivoted levers C C', also having wrist-pins c c', their inner ends being connected by links d d' with the sliding sleeve D. I have shown the arms B B secured to' the disk or wheel A by means of bolts a,and said arms are bent into U shape at their outer extremities to partly encircle the periphery of the pulley E, and terminating in the wrist-pins b b,as shown in Fig. 2. The pivoted levers C C are pivoted to the disk or wheel Abymeans of pivot-bolts c2, and each of said levers consists of a slightlybent arm provided with a wrist-pin at its outer end similar to thc wrist-pins b b', and at itsinner end has a universal bearing, c, which Works in a perforation in the end of one of the links, d. c4 is a washer that is intended to prevent accidental displacement of the universal bearing; but this may be dispensed with. The links d d are pivoted to the sliding sleeve D by means of pivot-pins d2 d2, as clearly shown in Fig. l. Ooncentric with the disk A is the pulley E on the driven shaft c, about the face of which are two parallel bands, F F', the ends of the former being connected with the wristpins b c, the end of the band being secured to the wrist-pin b by means of eyebolts f, the eye of which engages the wrist-pin b,the other end of said bolt being secured to a lug, f', onthe end of the band by means of nuts, as shown, and the other end of the band is secured to the wrist-pin c by means of a perforated lug, f2, fastened to the end of the band, the wrist-pin c passing through the perforation in said lug. The ends of the band F are connected to the wrist-pins b c in the manner just described. By moving the sleeve D toward the disk A the bands F F are simultaneously clamped on the pulley E, thereby causing the shaft e to rotate with the shaft ci until by an opposite motion of the sleeve D the bandsare released. By power due to the greatest available length of band, but as the levers C O move inunison they exactly counterbalance each other in any position, and the thrust on the sleeve being the same from opposite directions friction on the shaft is avoided. This form is especially adapted to line-shafting and direct acting mechanism. The bands F F are of springsteel, nearly or quite straight in their normal position, and hence when released they are by their own tension thrown' fronr contact with the pulley-face and rest against the stops G, which consist of dat bars fastened to the disk A and bent across and a short distance from the pulley-face.

In applying my invention to the transmission of motion to a loose pulley or drum mounted on the drivingshaft, particularly when great speed is required, I nd it preferable to have the frictional pulley-facetight on this arrangement I not only secure the t IOO the shaft, and connect the levers, arms, and

bands with the loose pulleys. Such an arrangement is shown in Figs. 4, 5, and 6, in which H is the driving-shaft, upon which are mounted a tight disk or pulley, I, and a loose pulley, J. Two hands,OO,surround the pulley I, one end of one of said bands, O, having conneeted .thereto a lug, o, th rough which passes an eyebolt, o', and secured to the lug o by means of nuts, as shown, andthe perforations ofthe eyebolt engages the wrist-pin il, secured to a lug, r, upon the inner periphery of the pulley J, and secures the band thereto. The other end of the band is secured to the wristpin 02 by means lof a perforated lug, o, fastened to the end of the band, the wrist pin o2 passing through the perforation in said lug. The band O is fastened in a like manner to the wristpins z' and L L are levers having universal bearings at their inner ends in links a a', which links are pivoted to a sliding sleeve, M, and pivoted at their outer ends to lugs 7c k', upon the inner periphery of the pulley J, by means of ,pivotpins k2 c3,whieh pass through the lugs k 7c and are secured to short arms ZZ', which arms carry the wrist-pins o2 o5. The operation of this arrangement is similar to that of the other construction, hereiubefore described.

The stops s for the bands O O project from the inside of the loose-pulley ri1n,and are each provided with a frietion-pulley, against which the bands run when out oi Contact with the frictional face.

The combination of a fast and a loose pulley, one of said pulleys being provided with aange and the other with two parallel bands which encircle said iange, two fixed arms carrying wrist-pins, two pivoted levers carrying wristpins,the sliding sleeve and the links connect ing said sliding sleeve to the pivoted levers, the two ends of one of said bands being attaehed,respeetively, to the wrist-pin carried by the fixed arm and the wrist-pin carried byY the pivoted lever mounted on one of said pulleys, and the two ends ofthe other band being respectively attached to the wrist-pin carried by the fixed arm and the wrist-pin carried by the pivoted lever mounted on the same pulley, the fixed arm and pivoted lever of one band being secured to the pulley diametrieally op posite the fixed arm and pivoted lever of the other band, the inner ends of said levers having universal bearings in links pivoted to the sliding sleeve on the shaft, said levers being arranged to simultaneously either draw said bands upon the Apulleyjiange or to release them therefrom, substantially as described. STEPHEN H. PITKIN. In presence of- G. I?. HUMPHREY, G. H. SUMMER. 

